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from __future__ import annotations
from typing import overload
from pydantic import BaseModel
from openhands.core.logger import openhands_logger as logger
from openhands.events.action.agent import CondensationAction
from openhands.events.event import Event
from openhands.events.observation.agent import AgentCondensationObservation
class View(BaseModel):
"""Linearly ordered view of events.
Produced by a condenser to indicate the included events are ready to process as LLM input.
"""
events: list[Event]
def __len__(self) -> int:
return len(self.events)
def __iter__(self):
return iter(self.events)
# To preserve list-like indexing, we ideally support slicing and position-based indexing.
# The only challenge with that is switching the return type based on the input type -- we
# can mark the different signatures for MyPy with `@overload` decorators.
@overload
def __getitem__(self, key: slice) -> list[Event]: ...
@overload
def __getitem__(self, key: int) -> Event: ...
def __getitem__(self, key: int | slice) -> Event | list[Event]:
if isinstance(key, slice):
start, stop, step = key.indices(len(self))
return [self[i] for i in range(start, stop, step)]
elif isinstance(key, int):
return self.events[key]
else:
raise ValueError(f'Invalid key type: {type(key)}')
@staticmethod
def from_events(events: list[Event]) -> View:
"""Create a view from a list of events, respecting the semantics of any condensation events."""
forgotten_event_ids: set[int] = set()
for event in events:
if isinstance(event, CondensationAction):
forgotten_event_ids.update(event.forgotten)
# Make sure we also forget the condensation action itself
forgotten_event_ids.add(event.id)
kept_events = [event for event in events if event.id not in forgotten_event_ids]
# If we have a summary, insert it at the specified offset.
summary: str | None = None
summary_offset: int | None = None
# The relevant summary is always in the last condensation event (i.e., the most recent one).
for event in reversed(events):
if isinstance(event, CondensationAction):
if event.summary is not None and event.summary_offset is not None:
summary = event.summary
summary_offset = event.summary_offset
break
if summary is not None and summary_offset is not None:
logger.info(f'Inserting summary at offset {summary_offset}')
kept_events.insert(
summary_offset, AgentCondensationObservation(content=summary)
)
return View(events=kept_events)
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